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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306ec9bb63ca9638f901e3b07c993a45d9401354a02223173f93bb6d0ffacf29' 
  AND token = 'pJw1fiSAo057zgyiW2PZXpao6lkZPWqI6aNgh/rE5VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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