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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bf06f1e6565ca332b8883c128b1fd71b7bbee5f8ce88b2d8cc7ab9fdcf2c48' 
  AND token = 'sI5qltPrmfW/o+lI6LvdIy5cv3R/Ffa5Joy0tPpLK8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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