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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5967373a4e93a82a9af4a19aaffe970aa74be11db1abd3c674567199647460b' 
  AND token = 'z8FIiHIAQsvUW9D7ZxGVJovNB3gNpXLFXxqg0rJTU9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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