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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4010434fb3ff0573430c7bd1edadcb2dad8ff0de3094e43c31eef9dc6174d8c' 
  AND token = '9ZDzNM317U571qM/wVevMznPvPgiYzZxDsIJn0TwBP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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