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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdaf1693b42e20303e909b07f6d85aab4b7e95877ae46a48a8df9482fa67c83' 
  AND token = 'WwhsjdCbRCySPuR5M55h2S9UzZvmDgdgA8/WQwDC7L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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