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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc6c1ae723a6d10f79f951cfa9b3fdcf25afcbc0f9c76e1dc270c0aa46d78dc' 
  AND token = '9QXhxYDet2efVw5a43sQrI2xPzIUNWsbJIh3I+n74Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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