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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bca804b564f9f5c46e9ff091032c578eeba8fb9c06704e2a5719bd2228e834' 
  AND token = 'vaDs05S0JSsKQp0Wyk0iJJRvWmq8m+uEWAX9TvMYF9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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