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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8e0914342f853e9c9ef413c6ed782bdabcf82bd90ad06e6f00a4594d512ae6' 
  AND token = 'Erg/jL4nZg3obvVAAClHlH3frNRQpG1XPQsCGTGGhP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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