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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5909aa0e41c04024efe747a4fee8581b5cc03a6d20da940da3c5f11168e30e8b' 
  AND token = 'X7wOLmjv45RYTZ59b+BBDADgR0Wp6/53WtB7B/Shjlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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