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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8417a93409507f8678edc2d9db6bb6fe0e0c4880121f5ce14bcd941f8a905eb' 
  AND token = 'j/5Sq6dcaVwk71QQHdXidb5l8etb8Sp6YOaxTHNxt8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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