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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c23b0b845cbf343fcb9f118f3f22918add116f7176e13232514bbf88f15574' 
  AND token = '8rxdn+UCYShjOVn7XsSTs0EsLmNU1jjpCP/oCpc71bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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