SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08df392808fc9482fc116bcb23877be2177ba7fa6785273c9318703851ee2514' 
  AND token = 'ZYn3hoBAyajixqiVO2PRFZc5QAhvNF2twX+nVCpDRsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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