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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98116bce94ba566cf40f4d73c17499c0470cb2d516021032a8a0e94ede016eea' 
  AND token = '8ASha+uukhy1Xea3RLm16lVObkin6eeaoXLt60LUcq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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