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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3886cb42016a6d7a301d4a60852baa8e8eedd93e08647f603b9b39b48356eb7' 
  AND token = 'ySpOOYyLQ4zhZruaVfuxT7KR87TImNx4g75xcdFr2jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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