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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c05298efda922db25ea9955676a93815ab4c852c6242ea18579183b7e3865da' 
  AND token = 'xNdxJjfHbZ+t+GcaaCbmgGjxs5DsnMu5EA5b5/2XAdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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