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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bde055b4d71c48e04c4fc53e369714090f16ebfd1ed38b225b20be1eb48563' 
  AND token = 'hioaBrpOxaApCzf8XA3dx2ThCu/voTiTNhdY6CDs53A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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