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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7029fa9610bc961f7bff15652b2585f6a191903acef0d4a74dceec0aaf07dcd' 
  AND token = 'xAnHUeTQpyjHhH8b6jtWlr6IWALJ/ehLIAsdV5flSiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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