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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d7b40afc695de6c3386e04cc9c3ba67aaa29db888c986b46f14da1b005fc7a' 
  AND token = 'mLfUeL0yB8QHDoiTqcsYn8uYtYy43C7qP0FZAL55C44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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