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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f49fcead23e8830b0d36c74ab62e51a55134a8353ce045e38b920338435d4b45' 
  AND token = 'Wj8yhAWb17IOgNWk4h6UcoJMMubhxgdtdbsEqm2cSsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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