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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cad9d39f438ae34e2194e35250e6ec5502f1fe612dc522bb9a9e3a7b7996f4' 
  AND token = 'dXN+yHdHquqSJ0yPAji+MijN7B/qcYfHt08j1famgQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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