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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af68f6a7f596b8910fe063a3a858e0cef5c7820d45303543ad12f07a6f76f3c' 
  AND token = 'oiohtgRC5P2HxeT5+x8mHxTYJCmUz/J1D+14Nef/tO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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