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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2f374c55490edef75d3c672732e5c013bd0c12ed73e06ad766e39535ed2b20' 
  AND token = '7puIKVQpF41M6wQVrpjEILEVC93x18BozBHJSBrXQ20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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