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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30acd81130fd9e22ba897bde8cabe9da0d3dc687ba664e298c6a423008722d8e' 
  AND token = '4+vTn0Gg47tV1nXADUyR7wDv9q92AqFdzJ6lGGOuDoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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