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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dee79ae096510807dbe53acde0ad0fbe5c95b052cdf3c645c62408631a34009' 
  AND token = 'H6X8KgX0PrY9G1Bjm9WDlQAnf2lYt1eGINqdg2JQVRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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