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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58732a148c4822744fd64e3cd274a910df64482cb58c77ce033796103411ec9d' 
  AND token = 'pFUAhRUwWlIfBKCjkkffTTkR1vTPvgAyl3/1jQ7EcLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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