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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9033a41c8beae1691c6d57f27990762bb1feb314df86a95ab833d3b516681e0a' 
  AND token = 'RBkZozXtPoAuStjEDhlPhWot+HbV1TBmHhodzJ363Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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