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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6bbedec286c64762243273f953ebd24f57a0b2cabae7973c447486eed0a07e' 
  AND token = 'dfiGa5GeaPlEwBdALNz3UicAJzea5mb3A8zpFXF5/mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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