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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea515f16867f4865ed6d0f73858af9cca2cb55068b4bf63288c6665692968eeb' 
  AND token = '30ue1elwpEM8hAq6GVrIIaDaFrv53/MHVe9FifG85ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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