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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c406e4f24b066cc3c2ecd337881c468653558d9859b12b76335e5a1c81c7dc' 
  AND token = '1nQr3wbC94BBXstSEUvuQL7gsV0vfKaDeYs5cu9XpKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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