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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a01fcc6406c60ddd4b07c8f22a22ee5ddb237c4a8a7e28e4dc67057c28b11c' 
  AND token = 'z9hRyO9NlQ94+E+5f86YF/OvQs5WPpe7EX4JXWpS+KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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