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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab30c270247cb86d3ebea87d318e8218274307aaa36c76ae4e38116c7986f65f' 
  AND token = 'ARKSKtjl0NHLxOzXQTdMk/cwJ2hj+c1+ljZa8gR1soc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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