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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedf64f7f2ab3d6045f7c23e2b6848a6ea990f1b0e4debd60121140fba49d47d' 
  AND token = 'X9eQPj/CseNrLvl7WWS7OCaXN4Uyu5uG9Pyauo4lPvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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