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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1905e4aa26154b5cc13fecdb6b4f6376abef17d23b390215e7d6a82ce5c58374' 
  AND token = '91Xyvb9wBHT9+HIlxFCVLiO1lUEIgVx0Uwo/tabFfgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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