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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fc0d2d8d26c798a90fe9dfe1839c7e42d0ac18dc689a3ce06350d3f5ae7f08' 
  AND token = 'K9eTWyQDwmNKo26CGq12qhj1jLvZG/Ft27iqx2WDS9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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