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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c49f3a1d0c3b07828604847ed4915717189515005ff6a609a266661d2e7b215' 
  AND token = 'WwnWlbZSXKsi6C+tZa83JRQEN9wRmlrkA4sQRrgF+nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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