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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089a2fb5b35ff70103eb621b71fbb6ef2abebd663a8c95c469b1809720e01d6c' 
  AND token = 'HlKY8JaLWeC6bAW6z0+K0HE30R5gT380cWYqKiKFZ9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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