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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113367a2e976a3ac6f850b8f74eaccc574774b7717cfe1ea9ee2d60d1b06e7dc' 
  AND token = 'oNc3e2FxXJNOzg7234PUfyuoEBTH/uetDilun7CRX4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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