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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f9eb12ac688877960f64275ebd49f224e10a52e74b1714e17e33ea43603e6d' 
  AND token = '3k+rjDlrFezk+LTIXcWCn19ZFjW38m/rqDHx0G8AGXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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