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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e47c00bc7cd963192561bf9ddef4940fd392c84f52838f957d79ce7e995304' 
  AND token = '2STOVmRBxn/dscQ99DrNb1SiSioLeQEk6au8JWw2LDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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