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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411e2923cf25bbdc1495e3e48e0955f1f948b90b67527574e56265757aa7e24d' 
  AND token = 'zLs8MXIrkQdtySDYQjNHibWFq93RMiU2JPs9tzUFmK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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