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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0d1d8d0c0e838d77e5454ab205a58eea8b769183b7648348abdce4f94aeb2f' 
  AND token = 'tJHwgU87bdR15+HGVa2oKIbxBZlcPQwpSPjt4HoRe+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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