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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6f0f744c332f2efc6ba21764cd2d258cbf3b066a309b9833f7d7b4cc7baa93' 
  AND token = '7xUR5+e5/gmBJ2BsVlkT9cZNt1HxysJavK07dyggV40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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