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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd701f6c6e3816ae28335bfefd6ae1460129ca220475b1abf555a6df8a8fae32c' 
  AND token = 'HrKB0Q4kkEyqHPcJX6lRfgruD7RtiC9ftyJRgfLfvr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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