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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57162ac5099381fa0a84779c76c4c5d2169ca9a51910bb357d3b28f97f4ed918' 
  AND token = 'YlYKXjqRQD5stGAOWcZ76qR4UTcQgfo8CqKUDdy9QTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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