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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50dd0c7e932ebbffc3b69e62e4c95236f585117ae30a90ee5641f1315c8ea11' 
  AND token = 'ueYWDATZohNrF4LvEbjaTvF0Dco89mgo4y2M/H73xtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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