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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71df56ebe54e08680ab37f9f2da29c25048950ea576751af9e7b64f603dbd5d0' 
  AND token = 'Sz4t008KltDAhHiseLyUD7DqUlJh3TbaAiCOqO8MkZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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