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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4ccb711599ed251d80bb39564bcddcb224a4dae4e017ab5d686a6f094a128c' 
  AND token = 'XNrr/IBKdDMTr6YR8fWfntjTBC8kYy/edEbRYwYl7U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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