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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfbe5e48b83dbe0b79b8504e4bbca595661c43c5ffa3d5100ebf2ddf4014587' 
  AND token = '9ZffugbokTgHWWjERFxEK+Sviy9Rd5ODmJC5kJap1uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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