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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c35a86b5a84c7683ae30e73ba07cabf4f79d3918877ee80e5aaed9bf17f36c9' 
  AND token = 'AVde+DfRDlY93N/8svo9Pw85NmHzhaiP1KujQoQ8GHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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