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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ae5da294e6aab6f864f783108f7939a75a7c79bb60065f13c735c2544713bd' 
  AND token = 'fCdiV53Qj+FQ0vmtal725FVtkI85kZaaW7ugzz9k1Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}