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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8739dcf76cb58808000556c7d07b8641f7bebb4c0278d1153c8e4b47fc156d72' 
  AND token = 'bmDOgv46eYRquQ73o5L9jcy2HZ+QtigwjFiKfZF3Q4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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