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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e2db5c051d048779e16a9614462468c18b874cef2dcf9de7adb1e9b7adadd5' 
  AND token = 'jsyhFPTLcWxL0L7MY82SDvmEpbGVr/S7pZxeKws0GQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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