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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360d9b29f26aef901e43293991261c9c92915f12f60ef9a8ad86a8c7f5281d37' 
  AND token = 'elg6460YrMeZEr06WpLEui8IYWHXXKKCFMUd83wavi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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