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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fddde04b0e8303aeb3f183bae9d9baf209d853dfe12b005a5636efd6c18ecc2' 
  AND token = '6Wn5uhbMyXC197t34F/aWs4UApHPsWhgAai08JDGIp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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