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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcffcbc013eceeb112357e6c215399c3ad73b6da7a081137bdd8792084612b45' 
  AND token = '7exd03JnBxRz9MxRa0F2rmcgXn8VfB6/bshFWEDovQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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