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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d475dbdb51df231e0a10cb945062b16de56fc12c23b23fe0d7d5c2d16ee0c9' 
  AND token = 'tNDELssgSF8rHx4EJiZEkHagnUdwZMjA7OLXhKVn+ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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