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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b5377423aca730b1639b288b9b4b2ce46b64d6ccba65caf20d7ed40115d37c' 
  AND token = 'nB4I8WdVitOiYy2ZCCC7XzF2m1R8erKgR7UALh45cVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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