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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6b5c757e3b871f3f5eaf134083174e528a02e9d1e7bef272d9586040e9ead2' 
  AND token = '/kL4eZoGROdaprjg+Bd2N8q633LSRxYKzZjzT8fi7Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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