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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f38db17f7327f11217988314445ccd0a459cb8a07f0252dbf35fa2c6bde08f' 
  AND token = 'dc33eSURFWz44fT/ftcanY5+UANsR63+YdnO5TJqqQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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