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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bf4d291a4fef89bc40ecca9e05060c5ceb195463f079c10b91f7ee77aa8866' 
  AND token = 'Ysl/49/cOC49KMMhz8i6izFNo5MsW7iyhRcd3mWfDnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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