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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9952bce8895d0257b72631f489748f02615e80819b28283e35f86c89b7af93' 
  AND token = '/jVSdCR6JGYd5EGAXY3F3vVVGeubEkYDnkM++v6kNRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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