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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5aaf1d3067d7c6ff76f040a5fce6b8e212a8bba8c84b1c5cf555a42e82d996' 
  AND token = 'UJ0uyT5cbToeJcWi7z9k5/smqe+9UVPWP+QVG1Z5sW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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