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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350248c9f9f0f580f316d9255995d548e592c96f68fa43234964ca6f81d4442c' 
  AND token = 'cWx65V1sHtq26a5546TbGZEDm7h2QVidxfGrEvNswTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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