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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c2cf748cb14e6770110c315a2f95ca85d53cb79b320f1726c3afad9c36cf16' 
  AND token = 'Sp8n2cOY6mNfacMj7HoSS7iH0FaQD2T0SHraIRWz2Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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