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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa57685fe79f1a03a65170d39e4a6d42b54b9123bbc786eb5030ed55bb4416b' 
  AND token = 'ZPe2K/tNUkSnF9eJjT7JB13Gr4QK5RXy44nX74slhz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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