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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e67330d0b41d1a97bbc1de6cfac6856a64cd69b65b052dd1c3dc831ca60795' 
  AND token = '0J4UFrX3cx7Ec6rotEdOxD/OmeJsu5Dv9fy5PzciBgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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