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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998cf86fc8d72400d428918082a3b259634e901bcc61e45f61cb444d8f9fde80' 
  AND token = 'NpnDuw6AZuKENENt2o53thYtCf3mGBWXkjK46hosQ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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