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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bebc5f14788ebaf7e1171293db99263ca6dc49a93f9ec84fb4cd737fda2f13f' 
  AND token = '11T5hh7u5ORtHxKGzUMcEoXR21MAkiXg7tf+w7M8xXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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