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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0975d7778c11fd3675a22b90e03f94d63ab3c72b6c76a1b2d8d1ee5bfda7429' 
  AND token = 'gXojiIWfXT5RS8HQvc9nhNcNW0h95iK2EsUe5a3ixNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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