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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d55fb473387d179bad33467876de4f68150d5faf6e8ca9a87eef82871eb1901' 
  AND token = 's1asu92n+txWi6xGA2Ws5EU7lbYFc74aVmyXvZI4mcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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