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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ee88c59cd385920f7d076e3d5d851e32b034737667a432758be0f7ba86e90b' 
  AND token = 'xt4ldKpOiw6jzmOaPOm9/I0YxbRcou4VzTmxqWOmJh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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