SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1028369e1da60c9ceaab4083023708026328426724d47973219270cd1f799c67' 
  AND token = '+VghIjzOXncPh9HCZCxlJTNIwrhx/K0N/Ug9z4UQMGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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