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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb004aa615dc47f11d0f33170129bd53fd5a399f0d71bfab78bb01c254b676c' 
  AND token = 'kLu10jajGZa079fSGMwRHcJhPzEDMQx/V3KjB9talpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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