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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80e0a54501e704545af1449ae9838c311fe6d4293f2713cd7cb6a0ec7feae28' 
  AND token = '8srNvjnNTbMqy8Elm+TyP8hEUOYycHMqMOiWlHjKWdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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