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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3734fcef4274855b0f7f9ee86d5e524637333dc306c031223bf9c4fea7b34f' 
  AND token = 'G0hYomOXinTHUER25RUJh8L4SoxV4dgq1qpK72ip65o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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