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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d9a3813171db38f81ecb16e472a2c072a7ead134f683d8a9d7b32bf7c38588' 
  AND token = '6dXuCB7O8jYgUfdv45qawkcIvaF4PWRe9WfmrnmTMCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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