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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce8b7a4dd6adb27bc0c19e4c9f6f016869ec84131f4d245e18b22659b084c6a' 
  AND token = '57tZDQ0oqLBCopCjd8JtPx7AqJXHIpVnnZxItSdHwcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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