SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361e65b6e141d56a0b1cbc7835adb4f165f8790721b21dd9c0fa7fa418d460ed' 
  AND token = 'ztPnLmbWEjy8/HK6cLUEpqrKGuJ0j3fy1/m4jJn7Ghw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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